有以下程序: #include <iostream> using namespace std; class A { private:int x,y; public:void set (int i,int j){ x=i; y=j;}int get_y(){ return y;} }; class box { private:int length,width;A label; public:void set(int 1,int w, int s,int p){ length=1; width=w; label.set(s,p);}int get_area(){ return length*width;} }; int main() {box small;small.set(2,4,1,35);cout<<small.get_area()<<end1;return 0; } 运行后的输出结果是( )。
A.8
B.4
C.35
D.70